Groundwater Dynamic And Prediction In Jinghui Canal Irrigation

Jinghui irrigated area is a of (type II) irrigation district,and it is a artesian diversion fromJing river,combined with Irrigation and drainage，double irrigation drainage Wells，givepriority to with agriculture as one of the large-scale water conservancy projects.It wasconstructed by modern water conservancy master Mr Li Yi zhijun in our country,watered in1932.Its predecessor was one of the three largest water conservancy project in ancient ZhengGuoqu,it was a irrigation area in June1932watered. With the development of social economy,people more and more high to the requirement of water quantity and quality, however, mininggroundwater became the main way to alleviate water shortage, This phenomenon leads tomany environmental problems of groundwater. So, the study of drainage and irrigationgroundwater dynamic is very important, It relationship to the development of the wholenational economy and ecological environment safety.This study collected and reviewed about the latest development of groundwaternumerical simulation and prediction in home and abroad, In the conclusion on the basis ofpredecessors’ research results, choose Jinghui irrigated area as a key research areas. Mainly tocollect and analyze the hydrogeological conditions, Social and economic development,Groundwater dynamic field data, Item data sources and boundary conditions, the conditionsuch as irrigation water quality analysis of the study area, further introduction explains thegroundwater dynamic type, drainage relationship and influencing factors of research area.The establishment of the hydrogeological conceptual model, first of all should be studying thehydrogeological conditions and boundary conditions of the area data are generalized, thenthrough Arcgis9.3software map and the control range of the study area vector quantization,toput it into Visual MODFLOW groundwater numerical simulation software, astablish a threedimensional numerical model for groundwater through the existing data, again through themodel for the study area is the iterative calculation of hydrogeological parameters(permeability and water level, Finally, assume that the two kinds of different scenarios, thegroundwater level forecast in2014.The main content of this study and the results roughly the following several aspects:(1) the first， divides the irrigation underground dynamic type. The groundwater in thestudy area can be classified into the type of general rainfall infiltration recharge-runoffdischarge under the condition of natural, but due to the influences of human activities in recent years, groundwater dynamic contact human activities reflect more larger, but aboveall,irrigation groundwater dynamic change can be divided into three types: the type ofirrigation rainfall recharge-mining drainage, the type of Irrigation rainfall recharge-runoffdischarge, the type of Irrigation rainfall recharge runoff discharge. The three types ofgroundwater dynamic reciprocal transformation, the transformation is related to the naturalfactors such as rainfall conditions, also related to the human factors such as irrigationexploitation, but generally speaking,irrigation and mining is to determine the main factors ofgroundwater dynamic on the basis of rainfall infiltration.(2) Analyzes the dynamic characteristics of groundwater in the study area. In order tocomprehensively analyze the changing rule of the groundwater were computed.in canalirrigation district,first of all, analyze the type of groundwater dynamic, Irrigation district canbe divided into two stages: before the Irrigation district is built and after the Irrigation districtis built. This is mainly based on considering the importance of artificial recharge in irrigationarea. The secondly,to collect data in the study area. Using statistical techniques of ArcGIS toanalyze elevation data and water quality data in1984,2002and1984of irrigation area, Brushfor the1984test points in QQpiot, Best fitting degree in2009. Most of the white area in2002,in1984and2009are relatively few in Voronoi, SanYuan occurred on the northeast of outliers,According to the analysis of the survey to know well point data are from the group belongs tothe shallow depth of the data, related to the local irrigation, the rest of the outliersinvestigation also don’t belong to the category of reason does not belong to eliminate.Analysis of water level in1984,2002200and1984, JingYang most regional groundwaterdepth is deeper, the greatest change near the FuPing and SanYuan QingYu river. And theground occurs subsidence phenomenon, groundwater funnel gradually expand, diving depthin shallow part shrink sharply, but1984dark area more than2002,the overall trend ofirrigation area water level falling.(3) Prediction of groundwater dynamic in the irrigation area. Used the above programsorting data were computed.in canal irrigation district, then using the Visual MODFLOWsoftware build hydrogeological conceptual model and the corresponding mathematical modelof groundwater, using a relatively complete the underground water level datas in2008and2009as the initial water level modeling, and inspection and recognition model. Simulationresults show that the measured and model of underground water level in the same generaltrend, but model simulation results and the error of the measured values of these areas islarger in Fuping, Gaoling,and SanYuanXian, especially close to the309,305and208theobservation wells near the area changed a lot, due to the relatively few data at Fuping near208wells, thus it has a large impact between the overall trend is relatively, so the error is very big. Irrigation and underground water level of groundwater simulation model to simulate themeasured water level in the same trend, Groundwater flow field and the measured flow basicsimilar, Simulated values and measured values of the correlation coefficient is above0.69.It’sfinally show similar between the model of groundwater flow field and the measuredon graph.(4) Put forward different ways of solution,to simulation research trends of regionground water level and dynamic prediction under different scenarios. To determine the modeland combined with local actual data, assume two different huiyuan control scheme, to add agiven item huiyuan groundwater water to validated numerical model, to predict the changetrend of groundwater level in2014, and put forward reasonable groundwater model. Theresults showed that under the condition of the two different assumptions, the research ofregional groundwater flow field in general has not changed, but one way to predict the waterlevel is higher than another,scheme2level significantly decline than2009, in general, thechange tendency of the two plans of groundwater is almost the same, just groundwater depthof scheme1is shallow,therefore, no matter what kind of plan, the overall trend of thegroundwater has been reduced, scheme2little older than the fall of scheme1,but overallrange is not very big, Irrigation area of underground water level decrease effectively controlare obtained.